/*
 * Copyright the original author or authors.
 * 
 * Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *	  http://www.mozilla.org/MPL/MPL-1.1.html
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.googlecode.milib.display {
	import com.googlecode.milib.base.MLBaseClass;
	import com.googlecode.milib.display.service.MLMC;

	import flash.display.MovieClip;
	import flash.display.Sprite;

	/**
	 * @author Marek Brun minim.pl
	 */
	public class SpritesProvider extends MLBaseClass {
		
		private var mlmc:MLMC;
		private var removedSprites:Array=[];		private var addedSprites:Array=[];

		
		public function SpritesProvider(mc:MovieClip) {
			mlmc=MLMC.forInstance(mc);
		}
		
		public function setAddedSpritesSum(sum:uint):void {
			if(addedSprites.length<sum){
				while(addedSprites.length<sum){
					getNextSprite();
				}
			}else{
				var sprite:Sprite;
				while(addedSprites.length>sum){
					sprite=addedSprites.pop();
					mc.removeChild(sprite);
					removedSprites.push(sprite);
				}
			}
		}
		
		public function getSpriteAtIndex(index:uint):Sprite {
			return addedSprites[index];
		}
		
		public function getNextSprite():Sprite {
			 if(!removedSprites.length){
			 	removedSprites[0]=new Sprite();
			}
			var sprite:Sprite=removedSprites.pop();
			mc.addChild(sprite);
			addedSprites.push(sprite);
			return sprite;
		}
		
		public function removeAllSprites():void {
			var sprite:Sprite;
			while(addedSprites.length){
				sprite=addedSprites.pop();
				mc.removeChild(sprite);
				removedSprites.push(sprite);
			}
		}
		
		public function get mc():MovieClip { return mlmc.mc; };
		
	}
}
